Test quality validation through mutation testing, assessing test suite effectiveness by introducing code mutations and measuring kill rate. Use when evaluating test quality, identifying weak tests, or proving tests actually catch bugs.
Install
npx skills add proffesor-for-testing/agentic-qe --skill mutation-testingnpx skills add proffesor-for-testing/agentic-qe --skill mutation-testing -a claude-code -gnpx skills add proffesor-for-testing/agentic-qe --skill mutation-testing -a codex -ggemini skills install https://github.com/proffesor-for-testing/agentic-qe.git --path .claude/skills/mutation-testinggh skill install proffesor-for-testing/agentic-qe mutation-testinggit clone --depth 1 https://github.com/proffesor-for-testing/agentic-qe /tmp/proffesor-for-testing__agentic-qe
mkdir -p ~/.claude/skills ~/.agents/skills
cp -R /tmp/proffesor-for-testing__agentic-qe/.claude/skills/mutation-testing ~/.claude/skills/mutation-testing # Claude Code
cp -R /tmp/proffesor-for-testing__agentic-qe/.claude/skills/mutation-testing ~/.agents/skills/mutation-testing # Codex, Cursor, Gemini CLI, Copilot, OpenCode